Hypertext Webster Gateway: "columbite"

From Webster's Revised Unabridged Dictionary (1913) (web1913)

Columbite \Co*lum"bite\, n. [Cf. F. colombite. See {Columbium}.]
(Min.)
A mineral of a black color, submetallic luster, and high
specific specific gravity. It is a niobate (or columbate) of
iron and manganese, containing tantalate of iron; -- first
found in New England.

From WordNet (r) 1.7 (wn)

columbite
n : a black mineral that is an ore of niobium and tantalum [syn:
{niobite}]


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